ICD-10 Code B34.0 – Adenovirus infection, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B34.0 – Adenovirus infection, unspecified
What it is
B34.0 identifies an adenovirus infection when the record does not specify the site or type of illness. Use it for a documented adenoviral illness without a more detailed diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Adenovirus may present with fever, upper respiratory symptoms, conjunctivitis, or gastroenteritis, but you should code only what the provider documents.
When to use this code
Use B34.0 when the provider documents adenovirus infection and does not identify a more specific manifestation or site. It is appropriate for unspecified viral illness attributed to adenovirus in the chart. If the record supports a specific adenovirus-related condition, code that condition instead.
Do not use for
Do not use B34.0 when the documentation specifies a different adenovirus condition, such as a localized infection or another confirmed diagnosis. Check documentation if the illness is coded elsewhere or remains unconfirmed.
Coding tip
Query the provider if adenovirus is mentioned but the infection site or manifestation is unclear.